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Permanent magnet, method for producing same, and motor and power generator each using same

A technology of permanent magnets and elements, applied in the fields of variable magnetic flux motors and variable magnetic flux generators, can solve problems such as rising steepness, and achieve the effect of suppressing rising

Active Publication Date: 2015-05-20
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high iron concentrations of Sm 2 co 17 Type magnets tend to have a steeper rise in the initial magnetization curve

Method used

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  • Permanent magnet, method for producing same, and motor and power generator each using same
  • Permanent magnet, method for producing same, and motor and power generator each using same
  • Permanent magnet, method for producing same, and motor and power generator each using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Weigh each raw material so that its composition is (Sm 0.85 Nd 0.15 )(Fe 0.28 Zr 0.025 Cu 0.05 co 0.47 ) 7.8 , and then arc melting in an Ar atmosphere to produce alloy ingots. The alloy ingot was heat-treated under the condition of 1170° C.×1 hour in an Ar atmosphere, coarsely pulverized, and finely pulverized by a jet mill to prepare an alloy powder. The alloy powder was pressurized in a magnetic field to form a pressed powder, and then sintered at 1190° C. for 3 hours in an Ar atmosphere, followed by heat treatment at 1170° C. for 3 hours to produce a sintered body. This heat treatment is performed for solution treatment.

[0080] Next, the sintered body after the solution treatment was heat-treated under the condition of 730° C.×1.5 hours as the first aging treatment, and then slowly cooled to room temperature at a cooling rate of 2° C. / min. Next, the sintered body after the first aging treatment was heat-treated as the second aging treatment under the condi...

Embodiment 2～4

[0082] Sintered magnets were produced in the same manner as in Example 1, except that alloy powders having the compositions shown in Table 1 were used. The first and second aging treatment conditions are the same as in Example 1. Here, the temperatures TB (° C.), [TB-50 (° C.)], and [TB+50 (° C.)] based on the respective alloy compositions are shown in Table 2. The sintered magnet thus obtained was used for the characteristic evaluation described later.

Embodiment 5

[0086] Weigh each raw material so that its composition is (Sm 0.9 Nd 0.1 )(Fe 0.34 Zr 0.03 Cu 0.05 co 0.58 ) 7.5 , and then arc melting in an Ar atmosphere to produce alloy ingots. The alloy ingot was placed in a quartz nozzle and melted by high-frequency induction heating. The molten body was then poured into a cooling roll rotating at a peripheral speed of 0.6 m / sec and continuously solidified to produce a thin ribbon. After the ribbon was roughly pulverized, it was finely pulverized by a jet mill to prepare alloy powder. This alloy powder was pressurized in a magnetic field to form a pressed powder, and then sintered at 1200° C. for 1 hour in an Ar atmosphere, followed by heat treatment at 1180° C. for 4 hours to produce a sintered body.

[0087] Next, the sintered body after the solution treatment was heat-treated for 1.5 hours at 850°C as the first aging treatment, and then heat-treated at 875°C for 4 hours as the second aging treatment, and then heat-treated at 1....

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Abstract

In an embodiment, a permanent magnet includes a composition represented by a composition formula: R(FepMqCur(Co1-sAs)1-p-q-r)z, where, R is at least one element selected from rare earth elements, M is at least one element selected from Ti, Zr, and Hf, A is at least one element selected from Ni, V, Cr, Mn, Al, Si, Ga, Nb, Ta, and W, 0.05@p@0.6, 0.005@q@0.1, 0.01@r@0.15, 0@s@0.2, and 4@z@9, and a two-phase structure of a Th2Zn17 crystal phase and a copper-rich phase. In a cross-section of the permanent magnet containing a crystal c axis of the Th2Zn17 crystal phase, an average distance between the copper-rich phases is 120 nm or less.

Description

technical field [0001] The present invention relates to a permanent magnet, a manufacturing method thereof, and a variable magnetic flux motor and a variable magnetic flux generator using the magnet. Background technique [0002] Two types of magnets, a variable magnet and a fixed magnet, are used in a variable magnetic flux motor and a variable magnetic flux generator. Al-Ni-Co-based magnets and Fe-Cr-Co-based magnets are currently used as variable magnets (see Patent Document 1). In order to increase the performance and output of variable magnetic flux motors and variable magnetic flux generators, it is desired to increase the coercive force and magnetic flux density of variable magnets. Known high-performance permanent magnets include Sm—Co-based magnets (see Patent Documents 2 and 3). In Sm-Co magnetite, Sm 2 co 17 The type magnet has a two-phase separation structure of the 2-17 type crystal phase and the 1-5 type crystal phase, and the magnet properties are obtained...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/00
CPCC22C19/07C22C33/02C22C2202/02H01F1/0557C22C1/02H01F41/0266H02K21/00
Inventor 堀内阳介樱田新哉冈本圭子萩原将也
Owner KK TOSHIBA
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